Suction pile foundation for a PLET subsea structure

Foresi, A; Bughi, Sabrina

doi:10.1201/b18442-18

Cited by 2 publications

(2 citation statements)

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“…It not only can be used as a deep-sea anchor foundation of floating platform, but also can be used as a support base of offshore structures [1][2][3] . At present, bucket foundation is also widely used in oil field manifold system, used as the foundation of heavy equipment such as wellhead or pipeline terminal [4,5] . In the stage of pipeline installation and operation, bucket foundation will be subjected to vertical load (V), horizontal load (H), moment (M) and torsion (T) from the superstructure.…”

Section: Introductionmentioning

confidence: 99%

Study on Calculation Method of VHMT Composite Bearing Capacity of Bucket Foundation for On-bottom Pipelines in Clay

Zhang¹,

Meng²,

Liu³

et al. 2022

Preprint

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Bucket foundation normally used as the basis of the pipeline terminal in oilfield or wellhead manifold system, and the length-to-diameter ratio is usually between 1 and 2. In the stage of installation and operation of the pipeline, bucket foundation will sustain vertical and horizontal force, moment and torsional load from the upper structure. However, most existing equations of capacity envelopes for bucket foundations are in terms of length-to-diameter ratios less than 1, and the influence of torsional load on composite bearing capacity of bucket foundation is not considered. In this study, finite element simulations are conducted to study the interaction between soil and bucket foundation (with a length-to-diameter ratio between 1 and 2) subjected to combined loadings. The influence of torsion on uniaxial bearing capacity and VHM composite bearing capacity is discussed respectively. The results showed that the torsion can cause bucket foundation VHM of bearing capacity of composite envelope surface decrease. With regression analysis of the calculation results, calculation formula of composite bearing capacity considering the effects of torsion is summarized.

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Section: Introductionmentioning

confidence: 99%

Study on Calculation Method of VHMT Composite Bearing Capacity of Bucket Foundation for On-bottom Pipelines in Clay

Zhang¹,

Meng²,

Liu³

et al. 2022

Preprint

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“…Subsea systems required a foundation system in order to be anchored into the marine soil deposits and suction caissons represent a pragmatic option ( Figure 2a). There are well-documented references that report the extensively use of suction caissons in floaters and subsea systems (Andersen et al, 2005;Valle et al, 2008;Silva et al, 2013;Foresi & Bughi, 2015;Kay, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluación numérica de la capacidad de carga combinada de pilotes de succión de sistemas submarinos para explotación de hidrocarburos en aguas profundas

Valle-Molina

Sánchez-Moreno

Santiago-Sacristán

et al. 2019

iit

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Suction caissons are used to fix submarine systems of production into the seafloor for exploding hydrocarbons. The foundations of submarine systems are subjected to combined or multiaxial loading, which consists in applying combinations of horizontal and vertical loading (H,V) with driving moments (M). The main objective of this research work was to estimate numerically the combined capacity by means of failure envelopes of a suction pile installed in normally consolidated soil and subjected to combined loading applied at the head. The failure envelope represents the boundary of the combination of loading that the pile-soil can withstand. Finite element program ANSYS® 14.5 was used to model the caisson-soil system and evaluate the capacity of the caissons subjected to 17 combinations of HM failure loading and 22 linked values of VM maximum loading. Each numerical result permit to conform failure surfaces, which for the HM capacity exhibit rotated elliptical shapes with clear symmetry, while failure envelopes of the MV plane exhibit thong-shape failure and are clearly non-symmetrical. In this research, the pure compressional capacity was 72% higher than the pure extensional capacity. The mechanisms of failure of the caissons loaded at the head meet very well with the modes reported in the oil industry. Caissons subjected to horizontal loading in positive convention (applied from left to right direction) and clockwise moment exhibited "external-scoop" mechanisms, while caisson under positive lateral loading and counter-clockwise moments might experience translational or rotational failure mechanisms. Finally, this research work permit to quantify the impact of the variation of the mechanical properties of the soil on the caisson capacity as well as the type and size of the failure modes of the foundation.

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Suction pile foundation for a PLET subsea structure

Cited by 2 publications

References 0 publications

Study on Calculation Method of VHMT Composite Bearing Capacity of Bucket Foundation for On-bottom Pipelines in Clay

Study on Calculation Method of VHMT Composite Bearing Capacity of Bucket Foundation for On-bottom Pipelines in Clay

Evaluación numérica de la capacidad de carga combinada de pilotes de succión de sistemas submarinos para explotación de hidrocarburos en aguas profundas

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